US PATENT SUBCLASS 331 / 77
.~ Wave filter


Current as of: June, 1999
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331 /   HD   OSCILLATORS

74  DF  COMBINED WITH PARTICULAR OUTPUT COUPLING NETWORK {2}
77.~ Wave filter


DEFINITION

Classification: 331/77

(under subclass 74) Subject matter wherein the output coupling network is of the passive type and is so designed as to pass waves of a desired frequency or band of frequencies with little attenuation while highly attenuating waves of other or undesired frequency or band of frequencies.

SEE OR SEARCH THIS CLASS, SUBCLASS:

32+, for oscillators having automatic frequency stabilization utilizing a stable heterodyne oscillator and wherein the frequency discriminator may be of the passive-filter type.

43, for beat frequency oscillators having a filter in the mixer output.

SEE OR SEARCH CLASS

333, Wave Transmission Lines and Networks, 167+, for passive type wave filters, per se.